Aqueous emulsion polymerization of fluorinated monomers in the presence of a partially fluorinated oligomer as an emulsifier
A technology for fluorinating monomers and oligomers, used in chemical/physical processes, chemical instruments and methods, transportation and packaging, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0120] Embodiment 1 (preparation has the VDF-HFP oligomer of ion terminal group)
[0121] Into a polymerization kettle equipped with an impeller agitator system and having a total capacity of 47.5 L was added 22.0 L of deionized water. The anaerobic kettle was then heated to 90°C and the stirrer system was set to 240 rpm. Add 202g dimethyl ether (Me 2 O), 200 g of hexafluoropropylene (HFP) to an absolute pressure of 25 bar and 85 g of vinylidene fluoride (VDF) were added to a reaction pressure of 4.0 bar absolute. Polymerization was initiated by adding 130 mL of a 31% aqueous solution of ammonium peroxodisulfate (APS). When the reaction started, the reaction temperature was maintained and the absolute reaction pressure was kept at 4.0 bar by feeding VDF and HFP into the gas phase at a feed ratio (HFP(kg) / VDF(kg)) of 0.653. In addition, an aqueous solution of ammonium peroxodisulfate (APS) having a concentration of 31% was continuously fed into the reactor at a feed rate of ...
Embodiment 2
[0130] Embodiment 2 (utilize the oligomer among the embodiment 1 to carry out the polymerization of TFE / HFP / VDF)
[0131] To a 50 L polymerization vessel was added 24 L of deionized water containing 5 L of the emulsifier solution prepared in Example 1. Air was removed by alternating operations of evacuation and pressurization to 4 bar with nitrogen. The vessel was then pressurized with HFP at 8.6 bar, VDF at 1.9 bar and TFE at 4.2 bar. The temperature in the vessel was adjusted to 70°C. 200 mL of an aqueous solution containing 9 g of ammonium persulfate (APS) was added to the vessel. The stirring speed was 240 rpm. Polymerization temperature and pressure were kept constant by feeding TFE, HFP and VDF in a constant ratio of 1:0.412:0.488. When 0.8 kg of TFE was consumed, the polymerization was stopped by stopping the monomer feed and reducing the stirring speed. The container was emptied, and the resulting dispersion was discharged. The dispersion thus obtained had a soli...
Embodiment 3
[0133] Example 3 (polymerization using oligomers prepared in situ)
[0134] 28 L of deionized water was added to the 50 L polymerization vessel. Air was removed by alternating operations of evacuation and pressurization to 4 bar with nitrogen. The vessel was then pressurized with HFP at 5.0 bar, VDF at 3.5 bar and ethane at 0.8 bar. The temperature of the vessel was adjusted to 70°C. Add 200mL aqueous solution to the container, wherein the aqueous solution contains 12g APS, 22mg CuSO 4 ·5H 2 O and 150 g of 10% aqueous sodium hydroxide solution. By pumping into a vessel containing 3 g of Na dissolved in 100 mL of deionized 2 S 2 o 5 aqueous solution to initiate the reaction. The stirring speed was 240 rpm. The temperature was kept constant and no monomer was added. When the reaction pressure was reduced by 1.5 bar, about 100 g of oligomers were formed. Polymerization was then initiated by pressurizing the vessel with 8.5 bar TFE to produce a fluorocopolymer of TFE, H...
PUM
| Property | Measurement | Unit |
|---|---|---|
| melting point | aaaaa | aaaaa |
| melt flow index | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More